unprecedented /ʌnˈprɛsɪˌdɛntɪd/ CET6 TEM4

• 1. 

  ADJ If something is unprecedented, it has never happened before. 史无前例的

  例：

  Such a move is rare, but not unprecedented.

  这样的举动少见，但并非从来没有过。

• 2. 

  ADJ If you describe something as unprecedented, you are emphasizing that it is very great in quality, amount, or scale. (质量、数量或规模) 空前的 [强调]

  例：

  The mission has been hailed as an unprecedented success.

  这次使命已被宣布为一次空前的成功。